One of the reasons I went for the SP3 was its modular design, so it would be possible to upgrade the SP3, by switching boards. The DAC used in the SP3 is either the same as in the BDA-1 or has a sound quality that is comparable.
In my naivety, I thought it would be easy to swap the DAC board for a board with the same DACs as in the BDA-3. Unfortunately, it couldn’t be done, according to James, when I asked him the question. The reasons were technical, the DAC board is incorporated in the system architecture or something like that.
A bit of a disappointment for me, because I feel that an SP3 with an internal BDA-3 DAC board could be a match made in heaven! I have no doubts that the upgrade costs would have been very high, though.
WillyP